from flask import render_template, current_app, session, g, abort, request, jsonify

from info import constants, db
from info.models import News, Category, User, Comment, CommentLike
from info.modules.news import news_blu
from info.response_code import RET
from info.utils.common import user_login_data


@news_blu.route('/comment_like', methods=['post'])
@user_login_data
def comment_like():
    """
    评论点赞
    1.获取参数
    2.校验参数
    3.查询评论
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')
    # 1.获取参数
    comment_id = request.json.get('comment_id')
    action = request.json.get('action')
    # 2.校验参数
    if not all([comment_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数不足')

    if action not in ['add', 'remove']:
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    # 查询评论
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询错误')

    if not comment:
        return jsonify(errno=RET.NODATA, errmsg='评论不存在')

    if action == "add":
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        if not comment_like_model:
            # 点赞评论
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            # 增加点赞数量
            comment.like_count += 1

    else:
        # 取消点赞评论
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()

        # 判断是否已添加关注
        if comment_like_model:
            db.session.delete(comment_like_model)
            # 减少点赞数量
            comment.like_count -= 1
        #
    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='点赞数据错误')

    return jsonify(errno=RET.OK, errmsg='OK')


@news_blu.route('/news_comment', methods=['post'])
@user_login_data
def news_comment():
    """
    添加新闻评论
    1.获取参数
    2.校验参数
    3.初始化评论模型
    :return:
    """
    # 1.获取参数
    user = g.user
    news_id = request.json.get('news_id')
    comment_content = request.json.get('comment')
    parent_id = request.json.get('parent_id')
    # 2.校验参数
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')

    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数不足')

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='数据类型错误')
    # 查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询失败')

    if not news:
        return jsonify(errno=RET.NODATA, errmsg='新闻数据不存在')

    # 3.初始化评论模型
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg='数据添加失败')
    return jsonify(errno=RET.OK, errmsg='OK', data=comment.to_dict())


@news_blu.route('/news_collect', methods=['post'])
@user_login_data
def news_collect():
    """
    新闻收藏
    1.获取参数
    2.校验参数
    3.查询新闻，并判断新闻是否存在
    4.收藏和取消收藏
    :return:
    """
    # 1.获取参数
    user = g.user
    news_id = request.json.get('news_id')
    action = request.json.get('action')
    # 2.校验参数
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')

    if not news_id:
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    if action not in ['collect', 'cancel_collect']:
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    # 3.查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询失败')

    if not news:
        return jsonify(errno=RET.NODATA, errmsg='新闻数据不存在')

    # 4.收藏和取消收藏
    if action == 'collect':
        if news not in user.collection_news:
            user.collection_news.append(news)
    else:
        if news in user.collection_news:
            user.collection_news.remove(news)
    return jsonify(errno=RET.OK, errmsg='OK')


@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    user = g.user

    # 右侧的新闻排行逻辑
    news_li = []
    try:
        news_li = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    news_dict_li = []
    for news in news_li:
        news_dict_li.append(news.to_basic_dict())

    # 查询新闻数据
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        abort(404)
    if not news:
        abort(404)

    news.clicks += 1

    # 判断用户是否收藏
    is_collected = False
    # if 用户已登录：
    # 判断用户是否收藏，如果已收藏
    #     is_collected = True
    if user:
        if news in user.collection_news:
            is_collected = True

    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='查询数据失败')

    comment_like_ids = []
    if user:
        try:
            # 需求：查询当前用户在当前新闻里都点赞了那些评论
            # 1. 查询出当前新闻的所有评论 ([COMMENT]) 取到所有的评论id  [1, 2, 3, 4, 5]
            comment_ids = [comment.id for comment in comments]
            # 2. 再查询当前评论中哪些评论被当前用户所点赞 （[CommentLike]）查询comment_id
            # 在第1步的评论id列表内的所有数据 & CommentList.user_id = g.user.id
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                     CommentLike.user_id == user.id).all()
            # 3. 取到所有被点赞的评论id 第2步查询出来是一个 [CommentLike] --> [3, 5]
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []
    for comment in comments:
        comment_dict = comment.to_dict()
        comment_dict['is_like'] = False
        if comment.id in comment_like_ids:
            comment_dict['is_like'] = True
        comment_dict_li.append(comment_dict)

    is_followed = False
    if news.user and user:
        if news.user in user.followed:
            is_followed = True

    data = {
        'user': user.to_dict() if user else None,
        'news_dict_li': news_dict_li,
        'news': news.to_dict(),
        'is_collected': is_collected,
        'comments': comment_dict_li,
        'is_followed': is_followed
    }

    return render_template('news/detail.html', data=data)


@news_blu.route('/followed_user', methods=['post'])
@user_login_data
def followed_user():
    user = g.user

    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')
    # 取参数
    user_id = request.json.get('user_id')
    action = request.json.get('action')

    # 判断参数
    if not all([user_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数不足')

    if action not in ('follow', 'unfollow'):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    # 取到要被关注的用户信息
    try:
        other = User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询错误')

    if not other:
        return jsonify(errno=RET.NODATA, errmsg='用户不存在')

    # 根据要执行的操作修改信息
    if action == 'follow':
        # 先判断是否关注
        if other not in user.followed:
            user.followed.append(other)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg='该用户已关注')

    else:
        if other in user.followed:
            user.followed.remove(other)
        else:
            return jsonify(errno=RET.NODATA, errmsg='用户不存在')

    return jsonify(errno=RET.OK, errmsg='OK')
